What do you think accounts for the difference? Observation bias? Or something different about the predator-prey relationship in each place?
I think its a bit of a complicated issue and personal observations dont really tell the story. I am also from MN and spend plenty of time up north though lately spend more time in NW WI.
First MN and WI have a ton of Wolves, far more than any Western state outside of ID (I think this is correct though I might be wrong) I think the estimates are 4,000 in MN and 3,000 in WI and in both states they are very concentrated in the northern areas.
Wolves can and do impact deer population though severe tends to be localized and temporary, changes in local pack demographics can impact deer both ways.
Its worth keeping in mind that deer are non-native to this area. There were very few if any 150 years ago when it was largely coniferous forest. After it was all logged off and was replaced by hardwood forest the elk disappeared, the moose population shrank and white tail moved in. These white tail also had negative impact on moose populations.
I think there is reasonable evidence that logging practices and agg practices, and winter weather patterns, have more impact on deer populations than wolves do at least broadly speaking. Wolf populations have also been relatively stable for quite some time (again speaking broadly over MN not locally) yet are blamed for deer population (or more frequently hunter success outcomes) that dont correspond to any change in wolf populations.
A note on livestock that I have always had trouble reconciling with the Western experience as well. You dont hear about extensive livestock predation here. There is a lone dairy farm 4 miles up the road from my cabin. Its surrounded by nothing but timber in all directions for miles. We have high wolf population density and I personally observed several last year which was unusual. My more reliable barometer which is amount and freshness of wolf shit on logging trails while grouse hunting also shows its quite high right now. Most people say deer populations are low right now. That rancher almost never looses cows or even calfs to wolves.
I do believe state management should be allowed as well as there being some current need to curtail populations. I am also not seeing any type of crisis. I think curtailing or logging driven by paper mills closing as we move more and more things digital is the big driver of deer population trends.
My experience here may have no bearing at all with what is seen out west.